Packing for piston-rods



(No Model.)

F. F. SWAIN.

PACKING POR PISTON Bons.

No. 398,756. Patented Feb. 26, 1889.

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UNITD Atras PATENT OFFICE.,

FRED F. SVAN, OF CHICAGO, llililNOlS.

PACKING FOR PISTGNHRODS.

SPECIFICATION forming part of Letters Patent No. 398,756, dated February 2G, 1889.

Application filed October 1G, 1888. Serial No. 288,403. (No model.)

To aZZ whom, t may concern:

Be it known that I, FRED F. SWAIN, ot' Chicago, Illinois, have invented certain new and useful Improvements in Packing for Piston- .Rods and Similar Devices, of which the following` is a specification.

The objects of my invention are to provide a packing with a metallic wearing-surface and an elastic backing to hold it against the rod, to avoid a too great bearing-surt`ace of metal upon the rod, to avoid a contact of the elastic body with the rod, and to provide an efficient packing for wet rods or pump-rods.

Other objects will be apparent from the eonstrl'ietion oi' my packin rlo these ends the invention consists in eertain devices and combinations speelt-led in the clahns at the end here/ol".

In the drawings, Figures l and 2 arc seetional views showing my invention as applied to a piston-nini, and Fig. 3 is a detail view of a piece oi' packing'. Fig. -i is a detail top view ot' a n'letallic ring-joint In the drawings, A reln'esenis a stuliingbox; li, the gland. l

(l is a piston-rml.

l) are metal rings on the rod (i.

E are rings oli' elastic material, such as rub ber or hemp. 'lhese rings are preferably ot' oblong cross-section, as shown, as that `lforni requires less pressure oli' the gland upon the backing to produce the requisite pressure of i a perfectlyelight liaeking on a steam-rod.

the metallic rings onV the rod.

l? is a. tongue or rib secured to one ol. the flattened sides of the elastic body E and adapted to entera groove inthe metallic ring l), thereby securing the metallic ring and the elastic ring together. This tongue maybe made ol.' rubber or other suitalde material, and it may be secured to the ring E in any desirable manner. `ln some eases the rings l) and E may be securm'l together by barbed seelionstongued together and an elastic backor other tacks or screws, as shown at (l in lfig. il. '.lhe metallic rings l) may be made in segments whose meeting ends are tongued together, the tongue on one segment entering a keriiA in the other, as indicated in Figs.

l and et. This eonstruetifni oli joint holds the segments secu rely together, an d also l'orms Then the gland is tightened on the packin g, the stufiingbox will be filled with a solid mass of elastic material, which, however, will have no contact with the rod, and between this elastic mass and the rod will be a series of rings, D, to take the wear. rlhese rings being' comparatively narrow, there will be but a small surface of contact with the rod compared with the length ot the stui'iiug-box, and hence there will be less danger of cutting the rod in ease ol.' grit getting into the box. In some eases, to increase the elasticity of the backing-rings, they may be formed with a rubber core or een ter, as shown at II in Fig. 2.

I in Fig. S shows a metal strip or bridgepiece placed in the groove of the metal rings over a joint, i'or the double purpose of protecting' the elastic material back of the metal and to prevent such elastic material being forced into the joint between the metallic segments, and thereby preveiiting their being closed together as they wear in use.

l are rings oi' cork or other material olI that eharaeter arranged in the spaces between the metal rings fl) in the ease oll pump-rods or other wet rods.

In the packing' which l have used i have found that this (ifombinz-'ltion ot elaslie backing, and metallic, wearing-surlaec with alternate rings ol' cork l'orins a perfectly-tight paekin on a wet rod, and l have also lound that the same packing without the cork forms lhis packing being composed ot independent metallic rings, each with. its own backing to hold it against the rod 'independently ot' the others, it can be satisfactorily applied to uneven` rods, and one,two, or more rings may be used, as desired.

lVhat l claim is"- l. ',lhe combination, substantially as set l'orth, ol,l a metal. wearing-ring composed of inge-ing ot' greater breadth than the metal ring and connected thereto.

2. lhe combination, sul)slantiallyY as set t'orth, of a series ol' ind ependent metallic wearing-rings having a bearing on the rod and an equal series ol elasiicbacking-rinof greater a tight joint andV prevents the blowing ol' l breadth thanV the metal rings and each c0nsteam through the joint.

neeted to its respective metal ring, whereby IOO said metal rings are kept apart or spaced upon the rod.

3. The combination, substantially as set forth, of a series of independent metallic Wearing-rings having' a bearing on the rod, an equal series of eiaste backing-rings of greater breadth than the metal rings and each oonneeted to its respective metal. ring' to keep said metal rings apart, and one or more cork rings in the spaces between the meta-1 rings.

4. The combination, substantially as set forth, of a metal Wearing-ring, an elastic back ing-ring, and a bridge-piece over the joint of 

